<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>生成器函数实例</title>
</head>
<script>
    //异步编程
    //1s后控制台输出111,2s后控制台输出222,3s后控制台输出333
    function one() {
        setTimeout(()=>{
            console.log(111)
            iterator.next()
        },1000)
    }
    function two() {
        setTimeout(()=>{
            console.log(222)
            iterator.next()
        },2000)
    }
    function three() {
        setTimeout(()=>{
            console.log(333)
            iterator.next()
        },3000)
    }

    function * gen() {
        yield one()
        yield two()
        yield three()
    }
    let iterator = gen()
    iterator.next()
</script>
</html>